Dr. vishnu Mahesh K. R » Публикация
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Опубликовано
2011-06-05
Опубликовано на SciPeople2011-10-04 05:59:18
ЖурналFront. Chem. China
Synthesis and characterization of organomodified Na-MMT using cation and anion surfactants
Аннотация
The Sodium Montmorillonite (Na-MMT) is not susceptible to polymer due to its organophilic character and low basal spacing. The primary objective of this study was to improve Na-MMT platelets separation by organically modifying it with cation and anion exchanges using Cetyl trimethyl ammonium bromide (CTAB) and Sodium dodecyl sulfate (SDS) respectively.
Basal spacing, presence of functional groups, Zetapotential
with particle size analysis and thermal
stability of the Organomodified Na-MMT (OMMT)
were characterized using XRD, FTIR, zeta-potential
analyzer and TGA respectively. The basal spacing of
CTAB modified OMMTincreased to 19.5 Å from 11.0 Å
which corresponds to the basal spacing of Na-MMT.
The SDS modified OMMT did not show any increase in
the basal spacing. FTIR spectra of CTAB modified Na-
MMT illustrated the attachment of CTAB functional
groups to Na-MMT, while the same was absent in the
case of SDS modified Na-MMT. The zeta-potential of
Na-MMT shifted from – 24.88 mV to 15.66 mV in the
case of CTAB modified Na-MMTand 12.49 mV for SDS
modified Na-MMT, indicating a greater surface potential of the modified nanoclay. The TGA showed greater weight loss for CTAB modified Na-MMT than that for Na-MMT, indicating the effective Na+ ion exchange with alkyl amines.
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